This could explain why Trump wants to back out of the debates..

Trump has faced growing questions over his mental acuity, with author Ramin Setoodeh saying last month he found the former president exhibiting “severe memory issues” during their six interviews. Business leaders who met with Trump recently complained he was “meandering” and “doesn’t know what he’s talking about.”

Earlier this year, Trump confused former South Carolina Gov. Nikki Haley, who served as his ambassador to the United Nations and was running against him for the presidential nomination, with former House Speaker Nancy Pelosi (D-Calif.).

Trump and his campaign insist the former president is healthy.

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Unlike Biden, Trump has already been nominated. It's probably too late to replace him with somebody else.